arch/i386/mach-voyager/voyager_basic.c

   1 /* Copyright (C) 1999,2001
   2  *
   3  * Author: J.E.J.Bottomley@HansenPartnership.com
   4  *
   5  * linux/arch/i386/kernel/voyager.c
   6  *
   7  * This file contains all the voyager specific routines for getting
   8  * initialisation of the architecture to function.  For additional
   9  * features see:
  10  *
  11  *      voyager_cat.c - Voyager CAT bus interface
  12  *      voyager_smp.c - Voyager SMP hal (emulates linux smp.c)
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/sched.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/ioport.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/init.h>
  23 #include <linux/delay.h>
  24 #include <linux/reboot.h>
  25 #include <linux/sysrq.h>
  26 #include <asm/io.h>
  27 #include <asm/voyager.h>
  28 #include <asm/vic.h>
  29 #include <linux/pm.h>
  30 #include <linux/irq.h>
  31 #include <asm/tlbflush.h>
  32 #include <asm/arch_hooks.h>
  33
  34 /*
  35  * Power off function, if any
  36  */
  37 void (*pm_power_off)(void);
  38
  39 int voyager_level = 0;
  40
  41 struct voyager_SUS *voyager_SUS = NULL;
  42
  43 #ifdef CONFIG_SMP
  44 static void
  45 voyager_dump(int dummy1, struct pt_regs *dummy2, struct tty_struct *dummy3)
  46 {
  47         /* get here via a sysrq */
  48         voyager_smp_dump();
  49 }
  50
  51 static struct sysrq_key_op sysrq_voyager_dump_op = {
  52         .handler        = voyager_dump,
  53         .help_msg       = "Voyager",
  54         .action_msg     = "Dump Voyager Status",
  55 };
  56 #endif
  57
  58 void
  59 voyager_detect(struct voyager_bios_info *bios)
  60 {
  61         if(bios->len != 0xff) {
  62                 int class = (bios->class_1 << 8)
  63                         | (bios->class_2 & 0xff);
  64
  65                 printk("Voyager System detected.\n"
  66                        "        Class %x, Revision %d.%d\n",
  67                        class, bios->major, bios->minor);
  68                 if(class == VOYAGER_LEVEL4)
  69                         voyager_level = 4;
  70                 else if(class < VOYAGER_LEVEL5_AND_ABOVE)
  71                         voyager_level = 3;
  72                 else
  73                         voyager_level = 5;
  74                 printk("        Architecture Level %d\n", voyager_level);
  75                 if(voyager_level < 4)
  76                         printk("\n**WARNING**: Voyager HAL only supports Levels 4 and 5 Architectures at the moment\n\n");
  77                 /* install the power off handler */
  78                 pm_power_off = voyager_power_off;
  79 #ifdef CONFIG_SMP
  80                 register_sysrq_key('v', &sysrq_voyager_dump_op);
  81 #endif
  82         } else {
  83                 printk("\n\n**WARNING**: No Voyager Subsystem Found\n");
  84         }
  85 }
  86
  87 void
  88 voyager_system_interrupt(int cpl, void *dev_id, struct pt_regs *regs)
  89 {
  90         printk("Voyager: detected system interrupt\n");
  91 }
  92
  93 /* Routine to read information from the extended CMOS area */
  94 __u8
  95 voyager_extended_cmos_read(__u16 addr)
  96 {
  97         outb(addr & 0xff, 0x74);
  98         outb((addr >> 8) & 0xff, 0x75);
  99         return inb(0x76);
 100 }
 101
 102 /* internal definitions for the SUS Click Map of memory */
 103
 104 #define CLICK_ENTRIES   16
 105 #define CLICK_SIZE      4096    /* click to byte conversion for Length */
 106
 107 typedef struct ClickMap {
 108         struct Entry {
 109                 __u32   Address;
 110                 __u32   Length;
 111         } Entry[CLICK_ENTRIES];
 112 } ClickMap_t;
 113
 114
 115 /* This routine is pretty much an awful hack to read the bios clickmap by
 116  * mapping it into page 0.  There are usually three regions in the map:
 117  *      Base Memory
 118  *      Extended Memory
 119  *      zero length marker for end of map
 120  *
 121  * Returns are 0 for failure and 1 for success on extracting region.
 122  */
 123 int __init
 124 voyager_memory_detect(int region, __u32 *start, __u32 *length)
 125 {
 126         int i;
 127         int retval = 0;
 128         __u8 cmos[4];
 129         ClickMap_t *map;
 130         unsigned long map_addr;
 131         unsigned long old;
 132
 133         if(region >= CLICK_ENTRIES) {
 134                 printk("Voyager: Illegal ClickMap region %d\n", region);
 135                 return 0;
 136         }
 137
 138         for(i = 0; i < sizeof(cmos); i++)
 139                 cmos[i] = voyager_extended_cmos_read(VOYAGER_MEMORY_CLICKMAP + i);
 140
 141         map_addr = *(unsigned long *)cmos;
 142
 143         /* steal page 0 for this */
 144         old = pg0[0];
 145         pg0[0] = ((map_addr & PAGE_MASK) | _PAGE_RW | _PAGE_PRESENT);
 146         local_flush_tlb();
 147         /* now clear everything out but page 0 */
 148         map = (ClickMap_t *)(map_addr & (~PAGE_MASK));
 149
 150         /* zero length is the end of the clickmap */
 151         if(map->Entry[region].Length != 0) {
 152                 *length = map->Entry[region].Length * CLICK_SIZE;
 153                 *start = map->Entry[region].Address;
 154                 retval = 1;
 155         }
 156
 157         /* replace the mapping */
 158         pg0[0] = old;
 159         local_flush_tlb();
 160         return retval;
 161 }
 162
 163 /* voyager specific handling code for timer interrupts.  Used to hand
 164  * off the timer tick to the SMP code, since the VIC doesn't have an
 165  * internal timer (The QIC does, but that's another story). */
 166 void
 167 voyager_timer_interrupt(struct pt_regs *regs)
 168 {
 169         if((jiffies & 0x3ff) == 0) {
 170
 171                 /* There seems to be something flaky in either
 172                  * hardware or software that is resetting the timer 0
 173                  * count to something much higher than it should be
 174                  * This seems to occur in the boot sequence, just
 175                  * before root is mounted.  Therefore, every 10
 176                  * seconds or so, we sanity check the timer zero count
 177                  * and kick it back to where it should be.
 178                  *
 179                  * FIXME: This is the most awful hack yet seen.  I
 180                  * should work out exactly what is interfering with
 181                  * the timer count settings early in the boot sequence
 182                  * and swiftly introduce it to something sharp and
 183                  * pointy.  */
 184                 __u16 val;
 185                 extern spinlock_t i8253_lock;
 186
 187                 spin_lock(&i8253_lock);
 188
 189                 outb_p(0x00, 0x43);
 190                 val = inb_p(0x40);
 191                 val |= inb(0x40) << 8;
 192                 spin_unlock(&i8253_lock);
 193
 194                 if(val > LATCH) {
 195                         printk("\nVOYAGER: countdown timer value too high (%d), resetting\n\n", val);
 196                         spin_lock(&i8253_lock);
 197                         outb(0x34,0x43);
 198                         outb_p(LATCH & 0xff , 0x40);    /* LSB */
 199                         outb(LATCH >> 8 , 0x40);        /* MSB */
 200                         spin_unlock(&i8253_lock);
 201                 }
 202         }
 203 #ifdef CONFIG_SMP
 204         smp_vic_timer_interrupt(regs);
 205 #endif
 206 }
 207
 208 void
 209 voyager_power_off(void)
 210 {
 211         printk("VOYAGER Power Off\n");
 212
 213         if(voyager_level == 5) {
 214                 voyager_cat_power_off();
 215         } else if(voyager_level == 4) {
 216                 /* This doesn't apparently work on most L4 machines,
 217                  * but the specs say to do this to get automatic power
 218                  * off.  Unfortunately, if it doesn't power off the
 219                  * machine, it ends up doing a cold restart, which
 220                  * isn't really intended, so comment out the code */
 221 #if 0
 222                 int port;
 223
 224
 225                 /* enable the voyager Configuration Space */
 226                 outb((inb(VOYAGER_MC_SETUP) & 0xf0) | 0x8,
 227                      VOYAGER_MC_SETUP);
 228                 /* the port for the power off flag is an offset from the
 229                    floating base */
 230                 port = (inb(VOYAGER_SSPB_RELOCATION_PORT) << 8) + 0x21;
 231                 /* set the power off flag */
 232                 outb(inb(port) | 0x1, port);
 233 #endif
 234         }
 235         /* and wait for it to happen */
 236         for(;;) {
 237                 __asm("cli");
 238                 __asm("hlt");
 239         }
 240 }
 241
 242 /* copied from process.c */
 243 static inline void
 244 kb_wait(void)
 245 {
 246         int i;
 247
 248         for (i=0; i<0x10000; i++)
 249                 if ((inb_p(0x64) & 0x02) == 0)
 250                         break;
 251 }
 252
 253 void
 254 machine_restart(char *cmd)
 255 {
 256         printk("Voyager Warm Restart\n");
 257         kb_wait();
 258
 259         if(voyager_level == 5) {
 260                 /* write magic values to the RTC to inform system that
 261                  * shutdown is beginning */
 262                 outb(0x8f, 0x70);
 263                 outb(0x5 , 0x71);
 264
 265                 udelay(50);
 266                 outb(0xfe,0x64);         /* pull reset low */
 267         } else if(voyager_level == 4) {
 268                 __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
 269                 __u8 basebd = inb(VOYAGER_MC_SETUP);
 270
 271                 outb(basebd | 0x08, VOYAGER_MC_SETUP);
 272                 outb(0x02, catbase + 0x21);
 273         }
 274         for(;;) {
 275                 asm("cli");
 276                 asm("hlt");
 277         }
 278 }
 279
 280 EXPORT_SYMBOL(machine_restart);
 281
 282 void
 283 mca_nmi_hook(void)
 284 {
 285         __u8 dumpval __attribute__((unused)) = inb(0xf823);
 286         __u8 swnmi __attribute__((unused)) = inb(0xf813);
 287
 288         /* FIXME: assume dump switch pressed */
 289         /* check to see if the dump switch was pressed */
 290         VDEBUG(("VOYAGER: dumpval = 0x%x, swnmi = 0x%x\n", dumpval, swnmi));
 291         /* clear swnmi */
 292         outb(0xff, 0xf813);
 293         /* tell SUS to ignore dump */
 294         if(voyager_level == 5 && voyager_SUS != NULL) {
 295                 if(voyager_SUS->SUS_mbox == VOYAGER_DUMP_BUTTON_NMI) {
 296                         voyager_SUS->kernel_mbox = VOYAGER_NO_COMMAND;
 297                         voyager_SUS->kernel_flags |= VOYAGER_OS_IN_PROGRESS;
 298                         udelay(1000);
 299                         voyager_SUS->kernel_mbox = VOYAGER_IGNORE_DUMP;
 300                         voyager_SUS->kernel_flags &= ~VOYAGER_OS_IN_PROGRESS;
 301                 }
 302         }
 303         printk(KERN_ERR "VOYAGER: Dump switch pressed, printing CPU%d tracebacks\n", smp_processor_id());
 304         show_stack(NULL, NULL);
 305         show_state();
 306 }
 307
 308
 309
 310 void
 311 machine_halt(void)
 312 {
 313         /* treat a halt like a power off */
 314         machine_power_off();
 315 }
 316
 317 EXPORT_SYMBOL(machine_halt);
 318
 319 void machine_power_off(void)
 320 {
 321         if (pm_power_off)
 322                 pm_power_off();
 323 }
 324
 325 EXPORT_SYMBOL(machine_power_off);